One-piece oven-unit frame and unit



April 14, 1931. F, w CUF-FE ONE-PIECE OVEN UNIT FRAME AND UNIT Filed July 19, 1928 3mm M j E11/VF@ t nuwmzwmwb Patented Apr. 14, 1931 .l UNITED- STATES PATENT OFFICE FREDERICK W. CUFFE, OF WAYNESBORO, VIRGINIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO EDISON GENERAL ELECTRIC APPLIANCE COMPANY, INC., OF CHICAGO, ILLINOIS, A CORPORATION F NEW YORK ONE-PIECE OVEN-UNIT FRAME AND UNIT Application filed July 19, 1928. Serial No. 294,035.

, This invention relates to improvements in oven unit construction, particularly of a type adapted for use in connection with electric ranges. i o

An object of lthis invention is to provide a heating unit for an oven comprising a main body portion consisting of one piece of ma-r terial, suitably stamped or otherwise formed into a desired shape for removably positionure 4, taken along line 6 6.

Figure 7 illustrates a perspective view of one of the cross members of the heating unit disclosing the folding contacts in assembled relationship therein.

The oven heating unit, according to this invention, consists of a main frame section, made of any suitable material such as sheet metal, and stamped or formed into any desirable shape .such as that disclosed in the 10 ing within the oven. Figures 3 and 4 of the drawing, wherein a A further object of this invention is to single piece of material has Vbeen formed provide an oven heating unit comprising a having an outwardly extending flange porframe member made of a single piece of tion 2, downwardly shaped side sections 3, suitable material and formed in such a manand inwardly extending bottom portions 4, as ner that the time required for pre-heating the clearly disclosed in Figure 3, while along one oven is reduced to a minimum, and warping sidev edge of portion 2 is provided a flange and twisting of the unit is practically elimiextension 5 for thepurpose of supporting a nated. terminal porcelain 6, through which suitable Another object of this invention is to proterminal contact elements 7 are adapted to 20 vide a heating unit comprising a. frame memextend. The outwardly extending flange ber of the lightest possible construction, the members 8, as clearly shown in Figure 4, are main portion of which is comprised of a sinmade of sufiicient width to be slidably and gle piece of properly shaped material havremovably positioned within an oven, paring cross members attached thereto in such a ticularly of the type common to electric manner as to allow for heat expansion and ranges and the like. Downwardly formed contraction and at the same time to prevent side members 9 extend from the flanges 8 and doubling or bulging of the cross members inwardly forming the bottom flange porwhich are provided with freely fitting retions 10. fractory bushings for the purpose of Sllp- The terminal porcelain 6 may be suitably porting the resistor or heating element. supported in the frame by any proper means Other obiects of this invention will appear such as that disclosed in Figures 2 and 3, from the following detailed description of wherein a bracket member 11, made of sheet the device and as disclosed in the single sheet metal or otherwise, is supported by the flange of drawings which is herewith made a part extension 5 by means of machine bolts 12, of this application. or otherwise,'the terminal porcelain 6 being In the dra-wingsadapted to extend through an opening in the Figure l illustrates a top plan view of the side 3 as a support for one end thereof, the oven heating unit disclosing the main frame, other end of the porcelain terminal 6 being cross bars and contactor springs in assemcarried in the bracket 11.A bled relationship. Adjacent to the bracket 11 is a fiange ex- Figure 2 represents a bottom plan view of tension 13 from the bottom flange 4 for the Figure 1. purpose of allowing space for openings 14 Figure 3 illustrates a sectional view of F igthereinv which give easy access to the terure 1, taken along line 3 3. minal contact screws 15,- whenever it is re- '45 Figure4 represents a sectional view of Figquired to bring the resistor or heating ure 1, taken along line 4 4. element 16 into electrical ycontact with the Figure 5 illustrates a sectional view of Figterminals 15. which connect with the fioating ure 4, taken along line 5 5. contact members` or terminals 7. 50. F1gure6representsasectional view of Fig In this invention it is preferred to construct the frame member, consisting of pori tions2, 3,4, 8, 9, V1() and 5, of a single piece of material inorder to prevent the warping or twisting of the units under heat, and to Vprovide th-e lightest type of construction,

also, for vthe purpose of reducing the time required for preheating the oven, to the lowest possible point. Y Y

The main frame having been constructed as above described is provided with cross members consisting preferably of two sections of material having flanged portions 17, 18, 19, and lextending at right angles to each other, tw'o of the iange portions 17 and 19 being adjacently positioned and securely fastened together by means of rivets 21, or otherwise, it being understood that the structure of the cross bars may be of any desirable type `without affecting the spiritV of this invention. l v .Y

, At intervals along the cross bars are suitable openings 22 for the purpose'of receiving freely fitting refractory supports 23 therein,

which are made of refractory material, such as porcelain, and provided with openings 24: f-or slidably receiving the resistors 16. Y

The cross-bars or membersare held firmly inposition within-the main frame by means of tongue portions 25, preferably integrally formed from the bottom iiange portions 10 of the frame. The tongue elements 25 are adapted to extend over and clamp the ends of the bar flanges 18 and 20 into firm but slidable relationship with the bottom'iange extensions 10 of the frame, in such a mannerv that the cross bars or members will be allowed freedom of expanson due to the heating of the oven, it being understood that the cross bars are the first to become heated and that the Vmeans ofholding these cross bars in position will prevent buckling and bulging-thereof, as wouldclearly be the case if their ends were fastened to the frame Vv'vithout the possibility of some sliding action. The freely fitting refractory elements 28 and the terminal'member 6 are located so as to insure perfect alignment- .ofthe.` various contacts f with the resistors 16.

f-It will' be understood that many changes Y andmodications may be made in the form of embodiment of this-invention within the scope of the following claims without de- Y. partingfrom the spirit of the invention.

" 'What I claim is: v Y 1. A heating unit for an oven comprising a main frame portion formed ofa single piece Y of material, cross members slidably V- positioned in the main frame portion for expansion and contraction allowance due toheat, floatingfrefractory bushings mounted in the Ycross members.

2. A heating unit for an oven comprising V a main frame portion formed of a single piece of material, cross members slidablyV positioned in the main frame portion for expansion and contraction allowance dueto heat,

tioned within the floating refractory bushings. Y

l 3. A heating unit for an ovenlcomprisinga main frame Vportion formed of a single piece of material, cross members slidably positioned in the main frame vportion for eXpansion and contraction allowance due-to heat, floating refractory-bushings mounted in the cross members, heating coils slidablyf'positioned within the floating refractory Vbushings, and a contact terminal mounted in the frame. 4. A heating unit for an oven comprising a main frame portion formed of a single piece of material, cross Vmembers slidably positioned in the main frame portion for expansion and contraction allowance due to heat, ioating refractory bushings mounted in the cross members, heating coils slidably posi-` tioned within the oating refractorybushings, and floating contact members mounted in the frame for assuring proper alignment. In testimony whereof 1 aHX my signature. v FREDERICK W. CUFFIE.' 

